Red Lord Origami

Tohno Akiha's Arc Drive.
For just a moment, she fully unleashes her power and “plunders” the opponent. The reason her hair turns red is because her true nature is shining through.
At one point in Tsukihime, the schoolhouse was totally covered in red threads, making escape impossible for the prey trapped within. Without a doubt, that was Origami. The outlandish spectacle from that time makes its reappearance during Tohno Akiha's Last Arc.

MB Act Cadenza PS2 Manual: Tsukihime Dictionary